MHT CET Chemistry question

Dry ice + A 2,3-Dimethylbutanoic acid. In this reaction 'A' is

Answer: (B)

Solution

Grignard reagent + CO2 followed by hydrolysis gives RCOOH, so R must be (CH3)2CH-CH(CH3)-, i.e. CH3CH(CH3)CH(CH3)MgBr, which gives

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Question ID VK-081351